Open bottom friction for automatic bobbins



Feb. 27, 1934. 1. SNOW 1,949,192

OPEN BOTTOM FRICTION FOR AUTOMATIC BOBBINS Filed March 11, 1951 2 Sheets-Sheet l ATTORNEY.

OPEN BOTTOM FRICTION FOR AUTOMATIC BOBBINS Filed March 11, 1931 2 Sheets-Sheet 2 Patented Feb. 27, 1934 UNITED STATES PATENF @FFHCE OPEN BOTTOM FRICTION FOR AUTOMATIC ROBBINS Application March 11, 1931. Serial No. 521,?39

Claims.

This invention relates to shuttles oi the type used in automatic looms.

In one type of such looms there is a battery of bobbins and when the filling on the bobbin in 5 the shuttle has almost run out, feeler mechanism acts upon transfer devices which force a full bobbin into the shuttle forcing out the old bobbin. At this time the thread is still running through the shuttle block and out the shuttle eye to the 0 selvage of the cloth and although it is out between the shuttle and the selvage, unless it is pulled back through the eye and clear of the shuttle, it is likely to become entangled with the thread on the full bobbin which takes the place of the empty one and to be pulled into the cloth with the thread on the new bobbin.

In order to deliver the filling thread smoothly in the warp, it has been found necessary to use some sort of friction device in the shuttle through which the thread from the bobbin passes between the bobbin and the shuttle eye.

This friction device naturally clings to the thread after it has been out between the shuttle eye and the cloth and thus tends to keep it in the path of the thread from the new bobbin and to prevent it from being pulled back through the eye by the old bobbin as it is forced out and dropped into a can.

This invention is a substantially all metal friction device located between the tip of the bobbin and the shuttle eye and so made that when the thread is running ed in the usual manner in a general line in prolongation of the axis of the bobbin, it must pass between friction members, but when the bobbin is knocked out or down thus pulling the thread down instead of horizontally, it clears the friction members entirely and as it is free, the remains of the thread are pulled back through the shuttle eye and go down into the can with the old bobbin.

Instead of a metal friction member or members, fibre, felt or other similar material, spring pressed, actuated by gravity or operative by its own resiliency can be used.

The principal feature is what I will call the thread release slot which extends from the back of the threading chamber down through the shuttle and the two friction members which I call blocks and which may also be described in some cases as shoes and in other cases as pads.

These friction members are positioned on each side of and above the back part of the thread release passage.

In the drawings, Fig. 1 is a plan of the front end of a shuttle with my device in place.

Fig. 2 is a perspective of the front end of a shuttle with the device in place and showing the thread in a different position from Fig. 1.

Fig. 3 is a vertical sectional elevation looking up on the line 33 of Fig. 1 with one of the friction blocks removed for clearness.

Fig. 4 is a vertical section enlarged as it would appear on the line .-i of Fig. 3 looking in the direction of the arrow if both sides of the frame and both friction blocks were shown.

5 is a view of the device shown in Fig. 1 looking upward but with the thread in a different position.

Fig. 6 is a View similar to Fig. i of a modification.

Fig. 7 is a plan View of Fig. 6.

Fig. 8 is a view from the bottom of Fig. 4 looking up in the direction of the arrow, also showing the thread.

Fig. 9 is a plan view of a modification.

Fig. 10 is a perspective view of a shuttle block removed from the shuttle embodying another modification.

Fig. 11 is an elevation from the back or positicn of the bobbin of the construction shown in Figs. 6 and '7.

Fig. 12 is a side elevation partly in vertical section of the construction shown in Fig. 10.

Fig. 13 is a view from the rear enlarged and partly in section of the construction shown in Figs. 10 and 12 and Fig. 14 is a view from the bottom of a shuttle with the construction shown in Figs. 10, 12 and 13 in place.

Fig. 15 is a view similar to Fig. 13 of a modification of that construction.

Fig. 16 is a vertical section viewed from the rear of another modification.

Fig. 17 is a plan view of the construction shown in Fig. 16.

Fig. 18 is a plan view of another modification in place in a shuttle and Fig. 19 is a perspective View of the friction device shown in Fig. 18 removed from the shuttle.

In the drawings, A represents a shuttle in which there is a bobbin chamber 12 for a bobbin such as C and a threading chamber 11 in prolongation of or in extension of the bobbin chamber 12.

B is a metal threading block of well known type through which is a passage 1 which may be considered as a part of the threading chamber 11. Bobbin chamber 12 extends entirely through the shuttle while the threading chamber extends down part way through except at 7 shown in Fig. 5 which is an extension of the bobbin chamber and also of the threading chamber and which I will call the friction release slot 7.

The end of this slot 7 comes up close to and. preferably slightly under the back edge 3 of shuttle block B.

E represents the eye in the side of the shuttle which as usual connects by open slot 14 with threading chamber 11.

The thread F from bobbin C passes out through the part 1 of threading chamber 11 thence bends around the usual thread pin and thence out through eye E in the side of the shuttle.

The friction device is indicated as a whole by H and is slipped into vertical dead end grooves 5 and 6 on each side of bobbin chamber 12 directly behind the back 3 of block B and in position directly over the friction release slot '7.

This friction device H comprises a frame 29 at the top of which is an open mouth 22 which slopes from each side down toward the center and then at the front, by which I mean the side nearest the shuttle block B, extends down into a dead end thread slot 23 which extends diagonally down to a point proximate the bottom of the threading chamber 11 and preferably slightly below it.

Mouth 22 at the back connects with a through thread release passage which includes a slot 24 which extends diagonally down in line with slot 23 to the bottom of the frame 29. This thread release passage extends forward under blocks 30 and 31 and in front of them and ends at the friction release slot '7, while the metal 26 between the bottom of slot 23 and the bottom of frame 29 holds the parts together.

As shown in Figs. 1 to 5 and 8, the frame 29 is made of sheet metal suitably bent to form at a vertical groove in which is fixed a friction block 30 the face of which where it adjoins the slots 23 and 24 is smooth and rounded.

21 is another vertical groove which I will call a block guide groove as it serves as a guide for the slidable friction block 31. The face of this slidable friction block 31 which adjoins slots 23 and 24 rests against the adjoining diagonal face of block 30 and is caused normally to engage therewith by suitable devices.

The normal contact between the faces of blocks 30 and 31 is inside the limits of slot 24 and of slot 23.

As shown, the devices to cause the block 31 to yield include a pivot pin 33 which passes through an enlarged pivot hole 32 and a spring 34 which bears against the inside of block 31 being guided by a guide shown as a screw 35.

Preferably the parts are so formed that near the mouth 22 the adjoining faces of the blocks 30 and 31 conform to the shape of the mouth while at the bottom, they are forced together by the spring 34.

Adjoining the metal 26 from the bottom of the front dead end slot 23 to the bottom of frame 29,

J the front lower ends of the blocks 30 and 31 are cut away as shown at 2 so that a thread 5' of the size ordinarily used in the shuttle can run freely through it. This cut away part 2 forms part of the thread release passage.

When the thread F is running straight from J the bobbin and passes between the friction blocks 30 and 31, the desired amount of tension or friction is produced by the use of the spring 34.

When, however, as shown in Fig. 2, the old bobbin C is knocked out, the drag of the thread F tends to swing it somewhat forward while at the same time the weight of the bobbin pulls the thread down, the "final result being that it slips through the front part 2 of the thread release passage entirely out from between the friction blocks 30 and 31 and gets entirely clear of the eye E and block B before the thread from the new bobbin gets down into the threading chamber 11.

In Figs. 6, 7 and 11, I show a friction device L which is a modification in which the frame as is similar to 29 with a dead end front slot 43 and through back slot 44 together with the vertical grooves and 41 for the friction blocks and 51. In this case, for each block, there are two pins such as 53, 53 which pass through horizontal slots 52, 52 and a spring 5% guided by a screw both positioned between the pins so that the tendency is to move the two blocks straight towards each other.

In this case, however, the front slot 43 and back slot 44 are vertical instead of diagonal and there is a special cut away part at the lower front of each block 50 and 51 forming the front part 48 of a thread release passage for the thread to run freely through.

As shown in Figs. 16 and 17, the springs may be dispensed with entirely. In this case, the frame 59 has a mouth 62, front slot 63 and back slot 64 and is provided on each side with two sets of pins 65, 65 and 66, 66. these pins on each side is a friction block such 67 or 68 the upper and lower faces of which slope from outside inward toward the slots 63 and 64 whereby the tendency of gravity is to cause them to slip down towards each other.

In Figs. 10, 12, 13 and 14 is shown a friction device '79 formed integral with and part of a metal threading block M which corresponds with B.

In this case, device 70 has a mouth 71 from which extend downward the front dead end slot 73 and back through slot '74 while in the vertical guide grooves 5 and '76 are the blocks 77, '78 both hung on pivot pins and one of which as shown is spring pressed by a spring '79.

In this case also there is shown a longitudinal hole which extends through the front and back walls of the device '70 and connects the'slots 73 and M the idea being so that the thread F can get into this hole 80 and tend to slip in and out of hole 80 as blocks '77, 78 pivot to and from the dotted line position shown in Fig. 13. 72 is the front of the thread release passage.

It is not necessary that the friction blocks or yieldable friction members should extend at right angles laterally across the shuttle between the bobbin chamber and the threading chamber, but as shown at K in Fig. 9, I can use a frame 149 substantially like 49, as see Fig. '7, except that it is bent at each side 1 10 and 141 of the apex 1 22 so that the wings 140 and 141 diverge forward. This brings the through slot 144 at the apex and the dead end slot 143 towards the front.

The guide grooves for the friction blocks 50 and 51, the blocks 50 and 51, pins 53, 52, springs 54, 5 1 and screws 55, 55 are the same as in the construction indicated by L.

The adjoining faces of the blocks 50 and 51 are curved as shown and the thread release slot 148 is left for the thread F to pass down through. if

By this arrangement, if a knot strikes the back adjoining faces of the blocks 50 and 51, they yield more readily than if they extended at right angles to the pull of the thread.

In Fig. 15 is shown a threading block with a longitudinal threading chamber 91 which does not extend entirely through, but is provided at the rear with the vertical thread release slot 92 on each side of which are the friction guide grooves 93 and 94 which do not extend quite to 3, slots 52, .1;

Positioned between the front of slot 92 and preferably do not extend through block 90.

In these grooves 93 and 94, are positioned pieces of yieldable felt 95 and 96 shaped at the top to correspond with the top part of block 90 which is open receiving mouth 97.

In Figs. 18 and 19, I show another 1nodification of he friction device with a vertical thread release slot and passage.

100 is a shuttle with a bobbin chamber 101 and threading chamber 102 with the recess 111 in which is positioned a friction device including the frame 103 which fits in the recess 111. This frame 103 is bent forward at 105 so as to form part of thread release slot 104 which comes directly over the friction release passage 114.

106 and 107 are friction blocks slidable in suitable grooves in frame 103 and pressed together as by springs 108 and 109.

113 is an open mouth which connects with the through back slot 115 and the dead end front slot 116. This slot 116 ends at the top of the projection 105.

I claim:

1. The combination with a shuttle for automatic looms having a bobbin chamber, a threading chamber and a friction release slot in downward extension thereof, and an open shuttle eye on one side which connects with the threading chamber; of a friction device positioned at the front of the bobbin chamber and the back of the threading chamber, said device including a frame having at the top an open mouth which connects at the front with a dead end thread slot which extends diagonally down proximate the top of the friction release slot, and which mouth connects with an open bottom and at the back with a through thread slot which extends diagonally down to the bottom of the frame and the top of the friction release slot, a block guide groove, a slidable friction block positioned in the block guide groove on one side of said thread slots, and a fixed friction block positioned on the other side of said slots, the slidable friction block being movable and spring pressed against the other block, there being a vertical thread release passage between the front of the frame below the front dead end thread slot and the friction blocks.

2, The combination with a shuttle for automatic looms having a bobbin chamber, a threading chamber and a friction release slot in downward extension thereof, and an open shuttle eye on one side which connects with the threading chamber; of a friction device positioned at the rent of the bobbin chamber and the back of the threading chamber, said device including a frame having at the top an open mouth which connects at the front with a dead end thread slot which extends down proximate the top of the friction release slot and which connects with an open bottom and at the back with a through thread slot which extends down to the bottom of the frame and to the top of the friction re lease slot, a block guide groove, a slidable friction block positioned in the block guide groove on one side of said thread slots and a fixed friction block positioned on the other side of said slots, the slidable friction block being movable and spring pressed against the other block, there being a vertical thread release passage between the front of the frame below the front dead end thread slot and the friction blocks.

3. The combination with a shuttle for automatic looms having a threading chamber, a bobbin chamber and a friction release slot in forward extension thereof, and an open shuttle eye on one side which connects with the threading chamber; of a friction device positioned at the front of the bobbin chamber and the back of the threading chamber, said device including a frame having at the top an open mouth which connects at the front with a dead end thread slot which extends down proximate the top of the friction release slot and which connects with an open bottom and at the back with a through thread slot which extends down to the bottom of the frame and to the top of the friction re lease slot, a block guide groove, a slidable friction block positioned in the block guide groove on one side of said thread slots and a friction block positioned on the other side of said slots there being a vertical thread release passage between the front of the frame below the front dead end thread slot and the friction blocks.

4. The combination with a shuttle for automatic looms having a bobbin chamber, a threading chamber and a friction release slot in downward extension thereof, and an open shuttle eye on one side which connects with the threading chamber; of a friction device positioned at the front of the bobbin chamber and the back of the threading chamber, said device including a frame of V shape with the apex towards the bobbin chamber, said frame having at the top an open mouth which connects at the front with 1 a dead end thread slot which extends down proximate the top of the friction release slot and which connects with an open bottom and at the back with a through thread slot which extends down to the bottom of the frame and to the top of the friction release slot, two block guide grooves which slope outward and away rom the bobbin chamber, there being in each guide groove a friction block slidable to and from the apex of the frame and being spring pressed towards said apex, there being a vertical thread release passage between the sides of the frame and extending down through the bottom of the shuttle.

5. The combination with a shuttle for automatic looms having a threading chamber, a bobbin chamber and a friction release slot in forward extension thereof, and an open shuttle eye on one side which connects with the threading chamber; of a friction device positioned at the front of the bobbin chamber and the back of the threading chamber, said device including a frame having at the top an open mouth which connects at the front with a dead end thread slot which extends down proximate the top of the friction release slot and which connects with an open bottom and at the back with a through thread slot which extends down to the bottom of the frame and to the top of the friction release slot, a block guide groove, a friction block positioned in the block guide groove on one side of said thread slots and a friction block positioned on the other side of said slots, there being a vertical thread release passage between he front of the frame below the front dead end thread slot and the friction blocks.

ISAAC SNOW. 

